Seismic Performance of Joints between Steel K-Style Outrigger Trusses and Concrete Cores in Tall Buildings
Publication: Journal of Structural Engineering
Volume 140, Issue 12
Abstract
This paper presents finite-element analysis (FEA) and experimental study on the seismic behavior of joints between steel K-style outrigger truss and concrete core in tall buildings. Two new joint types with different details, including the joints with outside steel plates and encased steel plates, were conceived and intensively compared. Elaborate FEA models of the joints were developed, and a preliminary finite-element study was first conducted to evaluate the failure modes and hysteretic behavior of the joints to support the preparation of the laboratory test program. Then two specimens with different joint details were tested under cyclic loads. Several indexes that could reflect the seismic performance of the joints, such as the strength degradation, the rigidity degradation, the ductility, and the energy dissipation capacity, were analyzed. The mechanism of the joints was also revealed based on the stress distributions obtained by further FEA and test results, and a simplified FEA model was finally proposed for a more general purpose in routine design practice, and could provide a powerful tool for future research in design methods of the joints. The FEA and experimental results indicated that the joints exhibited favorable seismic performance which could transfer the loads reliably, and the joint with outside steel plates was better than that with encased steel plates, with more construction convenience, higher buckling load, and less concrete cracks.
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Acknowledgments
The writers gratefully acknowledge the financial support provided by “Twelfth Five-Year” plan major projects supported by National Science and Technology (Grant No. 2011BAJ09B01) and Tsinghua University Initiative Scientific Research Program (Grant No. 2010Z03078).
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Published In
Journal of Structural Engineering
Volume 140 • Issue 12 • December 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 21, 2012
Accepted: Dec 27, 2013
Published online: Jun 20, 2014
Discussion open until: Nov 20, 2014
Published in print: Dec 1, 2014
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